Someone know how to program the throttle cut on DX18QQ (I guess it's exactly the same on DX18) I'm trying to programm it on H switch but don't work the way I want!

The idea is I would like to cut the throttle on the flip of the switch (for safety issue) but would like a idle when throttle cut is off.

Please help!

i know this might not be the same but for my 7s i have my throttle cut on a switch and on the adjustable knob i have a mix of knob to throttle and the rate is 22 so the motor idles when the throttle cut is off and stops when its on just adjust the knob until you get the idle speed you want